/*
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * Copyright (c) 2011 Pentaho Corporation and Contributors.  All rights reserved.
 */

package org.pentaho.metadata.libformula;

import org.pentaho.reporting.libraries.formula.EvaluationException;
import org.pentaho.reporting.libraries.formula.FormulaContext;
import org.pentaho.reporting.libraries.formula.LibFormulaErrorValue;
import org.pentaho.reporting.libraries.formula.function.Function;
import org.pentaho.reporting.libraries.formula.function.ParameterCallback;
import org.pentaho.reporting.libraries.formula.lvalues.TypeValuePair;
import org.pentaho.reporting.libraries.formula.typing.ExtendedComparator;
import org.pentaho.reporting.libraries.formula.typing.Type;
import org.pentaho.reporting.libraries.formula.typing.TypeRegistry;
import org.pentaho.reporting.libraries.formula.typing.coretypes.LogicalType;

public class InFunction implements Function {
  private static final TypeValuePair RETURN_TRUE = new TypeValuePair( LogicalType.TYPE, Boolean.TRUE );
  private static final TypeValuePair RETURN_FALSE = new TypeValuePair( LogicalType.TYPE, Boolean.FALSE );
  private static final long serialVersionUID = -3737884974501253814L;

  public InFunction() {
  }

  public String getCanonicalName() {
    return "IN";
  }

  public TypeValuePair evaluate( final FormulaContext context, final ParameterCallback parameters )
    throws EvaluationException {
    final int length = parameters.getParameterCount();
    if ( length < 2 ) {
      throw EvaluationException.getInstance( LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE );
    }

    final TypeRegistry typeRegistry = context.getTypeRegistry();
    final Object value1Raw = parameters.getValue( 0 );
    final Type type1 = parameters.getType( 0 );
    for ( int i = 1; i < parameters.getParameterCount(); i++ ) {
      final Object value2Raw = parameters.getValue( i );
      if ( value1Raw == null || value2Raw == null ) {
        throw EvaluationException.getInstance( LibFormulaErrorValue.ERROR_NA_VALUE );
      }

      final Type type2 = parameters.getType( i );
      final ExtendedComparator comparator = typeRegistry.getComparator( type1, type2 );
      final boolean result = comparator.isEqual( type1, value1Raw, type2, value2Raw );
      if ( result ) {
        return RETURN_TRUE;
      }
    }
    return RETURN_FALSE;
  }
}
